I build my first F1J model in 2000 year. On photo below you can see my typical model with curved tips.

(Click on image to see enlarge photo)

Sketch of this model .

Cyclon and Fora 1cc engine can used on this model. Best engines for my models Cyclon engines

Few years ago I build this model with "Black Magic" electronic timer, usually in  model use mechanical timer with "russian" gearing.

"Black Magic' F1J model.

New project "F1j folder".

I will add new photos of my F1J models  soon.